What are the chances of me getting 50/50 custody of my daughter?

Question Details: My ex and I started doing 1 week with mom, 1 week with dad when our daughter started kindergarten. She is doing great with school and when she is with me. However, her mom just recently said this is not working because our daughter is having behavior issues at her house. Yet I believe that it's due to the fact that her mom has a new baby. I think I have a good chance but my ex says no because our daughter needs her mom and can't be away from her for 7 days. Am I crazy thinking that this has worked for 10 weeks and I shouldn't be punished by taking my daughter away because my ex can't spend tas much time with her and that is what is causing these issues?

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